acid rain - rain which is polluted by chemicals, loss of biodiversity - species becoming extinct, ozone layer depletion - the ozone layer is being destroyed and becoming thinner, resource depletion - lack of natural resources worldwide, deforestation - rain forests and wooded areas being cut down, land degradation - soil and land pollution as well as desertification, air pollution - air that contains pollutants, climate change - negative changes to the world weather patters, marine pollution - the pollution of our oceans and seas, over population - the increasing population of the world, flood - a large amount of water covering an area that is usually dry, melt - to change from solid to liquid (example, from ice to water),

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